To expand on the answer by@sigtill, FME has a couple of Hub transformers that might help you:
OpenDroneMapCaller- the most cost effective solution.It will automatically install a Docker image of OpenDroneMap and process your images to extract a georeferenced orthomosaic.
Pix4D transformers- A more comprehensive solution, but more costly, is to get a Pix4D account, then use the Pix4D transformers to load your images and start the processing.Your results will include an orthomosaic, ground model and point cloud.For more information, please see thePix4D automationarticle.
To get a good model I would suggest using one of these software for these purposes:
- Pix4D (https://www.pix4d.com/)
- Agrisoft Photoscan
- Open Drone Map (https://www.opendronemap.org/)
Drone data usually contains lat/long, altitude and roll, pitch, yaw.
Usually people use software like Pic4D to turn that into a georeferenced image.
But I suppose in theory you could do the math to turn the relative altitude and orientation into ground resolution, and then use the resulting values in the RasterGeoreferencer.